if your keen to keep the 2tb - which in fact only puts out not much less ( around 5 to 10 HP less ) horsepower overall less than a stock 2TG , invest in say a pair of webers - get a set of redline manifold adaptors ( aussie based - sydney ) a warm cam - and the dizzy balanced to match the cam and youd have one uber sweet single cammer without having to swap to twin cams ..
Whack on a set of extractors , a good sporty exhaust and have fun -
whiteline and Kmac have all the suspension bits you need to make the car handle alot nicer - rear swaybar alone makes a tonne of difference !
My old ta22 had a warmed up 2tb in it and was a tonne of fun to drive - i miss it - but it has a good home and owner now